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Bean Aphids

Bean Aphids
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Their coloring is commonly black or very dark olive green, with some of these insects having distinct white waxy stripes on the upper surface of their abdomen.
They affect a wide range of garden plants, trees, and shrubs but primarily attack certain beans, peas, and celery. There are different host plants for the winter and summer. Winter host plants include the spindle tree, Viburnum. In summer, host plants include beans, docks, celery, peas, corn and spinach. They feed on plant sap and excrete plant sugars as honeydew. The honeydew often covers leaves which then usually become infested with black sooty mold. The forming of black sooty mold is less common when ants are present collecting the honeydew.